1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Hardware monitoring driver for Maxim MAX16064 |
4 | * |
5 | * Copyright (c) 2011 Ericsson AB. |
6 | */ |
7 | |
8 | #include <linux/kernel.h> |
9 | #include <linux/module.h> |
10 | #include <linux/init.h> |
11 | #include <linux/err.h> |
12 | #include <linux/i2c.h> |
13 | #include "pmbus.h" |
14 | |
15 | #define MAX16064_MFR_VOUT_PEAK 0xd4 |
16 | #define MAX16064_MFR_TEMPERATURE_PEAK 0xd6 |
17 | |
18 | static int max16064_read_word_data(struct i2c_client *client, int page, |
19 | int phase, int reg) |
20 | { |
21 | int ret; |
22 | |
23 | switch (reg) { |
24 | case PMBUS_VIRT_READ_VOUT_MAX: |
25 | ret = pmbus_read_word_data(client, page, phase, |
26 | MAX16064_MFR_VOUT_PEAK); |
27 | break; |
28 | case PMBUS_VIRT_READ_TEMP_MAX: |
29 | ret = pmbus_read_word_data(client, page, phase, |
30 | MAX16064_MFR_TEMPERATURE_PEAK); |
31 | break; |
32 | case PMBUS_VIRT_RESET_VOUT_HISTORY: |
33 | case PMBUS_VIRT_RESET_TEMP_HISTORY: |
34 | ret = 0; |
35 | break; |
36 | default: |
37 | ret = -ENODATA; |
38 | break; |
39 | } |
40 | return ret; |
41 | } |
42 | |
43 | static int max16064_write_word_data(struct i2c_client *client, int page, |
44 | int reg, u16 word) |
45 | { |
46 | int ret; |
47 | |
48 | switch (reg) { |
49 | case PMBUS_VIRT_RESET_VOUT_HISTORY: |
50 | ret = pmbus_write_word_data(client, page, |
51 | MAX16064_MFR_VOUT_PEAK, word: 0); |
52 | break; |
53 | case PMBUS_VIRT_RESET_TEMP_HISTORY: |
54 | ret = pmbus_write_word_data(client, page, |
55 | MAX16064_MFR_TEMPERATURE_PEAK, |
56 | word: 0xffff); |
57 | break; |
58 | default: |
59 | ret = -ENODATA; |
60 | break; |
61 | } |
62 | return ret; |
63 | } |
64 | |
65 | static struct pmbus_driver_info max16064_info = { |
66 | .pages = 4, |
67 | .format[PSC_VOLTAGE_IN] = direct, |
68 | .format[PSC_VOLTAGE_OUT] = direct, |
69 | .format[PSC_TEMPERATURE] = direct, |
70 | .m[PSC_VOLTAGE_IN] = 19995, |
71 | .b[PSC_VOLTAGE_IN] = 0, |
72 | .R[PSC_VOLTAGE_IN] = -1, |
73 | .m[PSC_VOLTAGE_OUT] = 19995, |
74 | .b[PSC_VOLTAGE_OUT] = 0, |
75 | .R[PSC_VOLTAGE_OUT] = -1, |
76 | .m[PSC_TEMPERATURE] = -7612, |
77 | .b[PSC_TEMPERATURE] = 335, |
78 | .R[PSC_TEMPERATURE] = -3, |
79 | .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_TEMP |
80 | | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_TEMP, |
81 | .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT, |
82 | .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT, |
83 | .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT, |
84 | .read_word_data = max16064_read_word_data, |
85 | .write_word_data = max16064_write_word_data, |
86 | }; |
87 | |
88 | static int max16064_probe(struct i2c_client *client) |
89 | { |
90 | return pmbus_do_probe(client, info: &max16064_info); |
91 | } |
92 | |
93 | static const struct i2c_device_id max16064_id[] = { |
94 | {"max16064" , 0}, |
95 | {} |
96 | }; |
97 | |
98 | MODULE_DEVICE_TABLE(i2c, max16064_id); |
99 | |
100 | /* This is the driver that will be inserted */ |
101 | static struct i2c_driver max16064_driver = { |
102 | .driver = { |
103 | .name = "max16064" , |
104 | }, |
105 | .probe = max16064_probe, |
106 | .id_table = max16064_id, |
107 | }; |
108 | |
109 | module_i2c_driver(max16064_driver); |
110 | |
111 | MODULE_AUTHOR("Guenter Roeck" ); |
112 | MODULE_DESCRIPTION("PMBus driver for Maxim MAX16064" ); |
113 | MODULE_LICENSE("GPL" ); |
114 | MODULE_IMPORT_NS(PMBUS); |
115 | |